Parameter.AllowNull Property

Specifies whether to treat an empty field as null.

Namespace : DevExpress.XtraReports.Parameters

Assembly : DevExpress.Printing.v25.2.Core.dll

NuGet Package : DevExpress.Printing.Core

Declaration

C#
VB.NET

csharp

[DefaultValue(false)]
public bool AllowNull { get; set; }

<DefaultValue(False)>
Public Property AllowNull As Boolean

Property Value

Type	Default	Description
Boolean	false

true , to treat an empty field as null; otherwise, treat an empty field as string.empty.

Remarks

The AllowNull option determines whether to treat an empty field as null or as string.empty (or as an empty array for the multi-value parameter).

C#
VB.NET

csharp

using DevExpress.XtraReports.Parameters;
// ...
report.Parameters["date"].AllowNull = true;

Imports DevExpress.XtraReports.Parameters
' ...
report.Parameters("date").AllowNull = True